During April 2026, this developer focused on refining filesystem semantics in the DragonOS-Community/DragonOS repository by implementing Linux-compliant fchown behavior for O_PATH file descriptors. Using C++ and leveraging kernel development expertise, they ensured that attempts to change ownership on O_PATH file descriptors now correctly return EBADF, aligning user-space expectations with Linux standards. Their approach included expanding GTest-based regression test coverage, utilizing RAII patterns for robust resource management, and consolidating validation logic to reduce redundant fd_table lookups. This work improved system reliability, enhanced CI validation, and strengthened cross-component consistency, demonstrating depth in system programming and attention to correctness in kernel interfaces.